What are your favorite make-ahead cookies or desserts?

Pfeffernusse (spice cookies with a hit of pepper), oatmeal raisin cookies, gingerbread men, pistachio cookies (makes a nice Christmas display esp if you pair them with cranberry or dried cherry cookies), pecan sandies, rainbow crisps (on the borderline between cookies and crackers, lovely served with cheese and pepper jelly), anything with macadamia nuts.

A lot of cakes would be fine at room temperature, wrapped, until Tuesday. Cookies that get better with age tend to be really moist or really crisp. Meringue is ok if you can keep it super duper dry. Quick breads are also a great option, especially if they're moist like banana bread, or olive oil cake. You could also make ganache tonight, keep it at room temp, and make quick truffles on Tuesday. Serve with great coffee or tea and no one will complain!

Gee, a lot of cookies are fine two days after baking, including standard sugar cookies, shortbread, chocolate chip, etc. Some are even better with some age like gingerbread/lebkuchen.

Poached fruit is also something that does okay with storage.

I would nix any pie/tart. Those are never as good after the day they are baked. Acceptable? Yes. Great? No.

Good luck.